This dessert is also known as pastel imposible – impossible cake. As you can see below, the cake batter and the flan switch places in the oven. My oldest daughter requested this as the birthday cake for her 9th birthday party, capping an all-Rick-Bayless menu of tequila-infused queso fundido, guacamole, fajitas made with grilled chicken and chipotle flank steak, fried black beans, chorizo, and Mexican red rice – all made using Rick Bayless recipes.